RE: Logical Replication of sequences

From: "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>
To: 'Alexander Lakhin' <exclusion(at)gmail(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Shlok Kyal <shlok(dot)kyal(dot)oss(at)gmail(dot)com>, Nathan Bossart <nathandbossart(at)gmail(dot)com>
Cc: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Chao Li <li(dot)evan(dot)chao(at)gmail(dot)com>, shveta malik <shveta(dot)malik(at)gmail(dot)com>, Shinya Kato <shinya11(dot)kato(at)gmail(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, "Zhijie Hou (Fujitsu)" <houzj(dot)fnst(at)fujitsu(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Nisha Moond <nisha(dot)moond412(at)gmail(dot)com>, Peter Eisentraut <peter(at)eisentraut(dot)org>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Euler Taveira <euler(at)eulerto(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, "Jonathan S(dot) Katz" <jkatz(at)postgresql(dot)org>
Subject: RE: Logical Replication of sequences
Date: 2026-01-20 03:08:55
Message-ID: OS7PR01MB145594DAC6544508FDBD88099F589A@OS7PR01MB14559.jpnprd01.prod.outlook.com
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Dear Alexander,

> FWIW, this issue is not reproduced at 7a485bd64~1, maybe this should be
> taken into account.

To confirm, are you saying that the issue cannot be reproduced before 7a485bd64
right? I think it's because try_relation_open() is used in pg_get_sequence_data().
Before the commit we forcibly open the relation and raise an ERROR if it fails.
The sequencesync worker exits and tries again - everything is OK.

After the commit, however, we allow to fail opening and the SQL function returns
NULL - this can cause the assertion failure.

Best regards,
Hayato Kuroda
FUJITSU LIMITED

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